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Well, after the better part of a year of replacing sensors, fuel injectors, computers and the like I finally found the reason that the 944 N/A was giving me the intermittent idle problem, and the only reason that I worked on the car today was the 88 765 daily work ride blew a head gasket so failure was not an option!
After a careful review of the factory green book on the Regina components without any success, I decided that the fuel side was not the issue so the problem must be in the ignition somewhere. I pulled the factory manual out again and looked at the 'Rex' side for anything that would cause the intermittent idle after warm up. The only thing the manual had was check the spark plugs. I distinctly remembered installing a new set of Bosch plugs last year during a tune up but thought that I would start there anyway. To my utter amazement (and embarrassment!) the plugs in the car were the factory original 'Volvo' plugs with 266k miles on them! They were burned off past recogition on the electrode but still firing. I replaced them with a new set of plugs and the car runs like a new one. I still can't remember where the new Bosch plugs went but that happens pretty frequently at my age.
To everyone who pitched in with advice, it was much appreciated.
Regards,
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Will Dallas, www.willdallas.us, www.willdallas.org, www.willdallas.com 86 245 DL 222K miles, 93 940 260K miles, 88 765 GLE 152K miles
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